Permabanned
I think it's one of the requirements. Not for legal nationality, but for actual nationality. Say, for example, an English person moved to Spain, became permanently resident in Spain and acquired Spanish nationality in a legal sense but lived in a de facto English enclave. Only spoke English, only ate imported English food and, most importantly, thought of themself as English. They're not really Spanish, even if they do legally have Spanish nationality.
I think nationality is about where you perceive your home to be. Not necessarily where you live but where you perceive your home to be. Here's an example within the UK:
Person A migrated from Jamaica to England in the 1950s/60s and has lived here ever since. They have UK citizenship. They perceive England as their home. They talk about it that way, it's their state of mind. They see themself as English. So do I.
Person B migrated from Jamaica to England in the 1950s/60s and has lived here ever since. They have UK citizenship. They perceive Jamaica as their home. They talk about it that way, it's their state of mind. They see themself as Jamaican. So do I.
Well put, sadly many fall into the category of Person B, and a lot of true British seem to, nowadays, wish they were of a different nationality, yet steadfastly remain here, moaning and castigating the UK and its history.